// Copyright 2017 The Native Object Protocols Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <gtest/gtest.h>

#include <array>

#include <nop/utility/sip_hash.h>

using nop::BlockReader;
using nop::SipHash;

namespace {

const std::size_t kMaxLength = 64;

const std::array<std::uint8_t, 8> kVectors[kMaxLength] = {
    {{0x31, 0x0e, 0x0e, 0xdd, 0x47, 0xdb, 0x6f, 0x72}},
    {{0xfd, 0x67, 0xdc, 0x93, 0xc5, 0x39, 0xf8, 0x74}},
    {{0x5a, 0x4f, 0xa9, 0xd9, 0x09, 0x80, 0x6c, 0x0d}},
    {{0x2d, 0x7e, 0xfb, 0xd7, 0x96, 0x66, 0x67, 0x85}},
    {{0xb7, 0x87, 0x71, 0x27, 0xe0, 0x94, 0x27, 0xcf}},
    {{0x8d, 0xa6, 0x99, 0xcd, 0x64, 0x55, 0x76, 0x18}},
    {{0xce, 0xe3, 0xfe, 0x58, 0x6e, 0x46, 0xc9, 0xcb}},
    {{0x37, 0xd1, 0x01, 0x8b, 0xf5, 0x00, 0x02, 0xab}},
    {{0x62, 0x24, 0x93, 0x9a, 0x79, 0xf5, 0xf5, 0x93}},
    {{0xb0, 0xe4, 0xa9, 0x0b, 0xdf, 0x82, 0x00, 0x9e}},
    {{0xf3, 0xb9, 0xdd, 0x94, 0xc5, 0xbb, 0x5d, 0x7a}},
    {{0xa7, 0xad, 0x6b, 0x22, 0x46, 0x2f, 0xb3, 0xf4}},
    {{0xfb, 0xe5, 0x0e, 0x86, 0xbc, 0x8f, 0x1e, 0x75}},
    {{0x90, 0x3d, 0x84, 0xc0, 0x27, 0x56, 0xea, 0x14}},
    {{0xee, 0xf2, 0x7a, 0x8e, 0x90, 0xca, 0x23, 0xf7}},
    {{0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1}},
    {{0xdb, 0x9b, 0xc2, 0x57, 0x7f, 0xcc, 0x2a, 0x3f}},
    {{0x94, 0x47, 0xbe, 0x2c, 0xf5, 0xe9, 0x9a, 0x69}},
    {{0x9c, 0xd3, 0x8d, 0x96, 0xf0, 0xb3, 0xc1, 0x4b}},
    {{0xbd, 0x61, 0x79, 0xa7, 0x1d, 0xc9, 0x6d, 0xbb}},
    {{0x98, 0xee, 0xa2, 0x1a, 0xf2, 0x5c, 0xd6, 0xbe}},
    {{0xc7, 0x67, 0x3b, 0x2e, 0xb0, 0xcb, 0xf2, 0xd0}},
    {{0x88, 0x3e, 0xa3, 0xe3, 0x95, 0x67, 0x53, 0x93}},
    {{0xc8, 0xce, 0x5c, 0xcd, 0x8c, 0x03, 0x0c, 0xa8}},
    {{0x94, 0xaf, 0x49, 0xf6, 0xc6, 0x50, 0xad, 0xb8}},
    {{0xea, 0xb8, 0x85, 0x8a, 0xde, 0x92, 0xe1, 0xbc}},
    {{0xf3, 0x15, 0xbb, 0x5b, 0xb8, 0x35, 0xd8, 0x17}},
    {{0xad, 0xcf, 0x6b, 0x07, 0x63, 0x61, 0x2e, 0x2f}},
    {{0xa5, 0xc9, 0x1d, 0xa7, 0xac, 0xaa, 0x4d, 0xde}},
    {{0x71, 0x65, 0x95, 0x87, 0x66, 0x50, 0xa2, 0xa6}},
    {{0x28, 0xef, 0x49, 0x5c, 0x53, 0xa3, 0x87, 0xad}},
    {{0x42, 0xc3, 0x41, 0xd8, 0xfa, 0x92, 0xd8, 0x32}},
    {{0xce, 0x7c, 0xf2, 0x72, 0x2f, 0x51, 0x27, 0x71}},
    {{0xe3, 0x78, 0x59, 0xf9, 0x46, 0x23, 0xf3, 0xa7}},
    {{0x38, 0x12, 0x05, 0xbb, 0x1a, 0xb0, 0xe0, 0x12}},
    {{0xae, 0x97, 0xa1, 0x0f, 0xd4, 0x34, 0xe0, 0x15}},
    {{0xb4, 0xa3, 0x15, 0x08, 0xbe, 0xff, 0x4d, 0x31}},
    {{0x81, 0x39, 0x62, 0x29, 0xf0, 0x90, 0x79, 0x02}},
    {{0x4d, 0x0c, 0xf4, 0x9e, 0xe5, 0xd4, 0xdc, 0xca}},
    {{0x5c, 0x73, 0x33, 0x6a, 0x76, 0xd8, 0xbf, 0x9a}},
    {{0xd0, 0xa7, 0x04, 0x53, 0x6b, 0xa9, 0x3e, 0x0e}},
    {{0x92, 0x59, 0x58, 0xfc, 0xd6, 0x42, 0x0c, 0xad}},
    {{0xa9, 0x15, 0xc2, 0x9b, 0xc8, 0x06, 0x73, 0x18}},
    {{0x95, 0x2b, 0x79, 0xf3, 0xbc, 0x0a, 0xa6, 0xd4}},
    {{0xf2, 0x1d, 0xf2, 0xe4, 0x1d, 0x45, 0x35, 0xf9}},
    {{0x87, 0x57, 0x75, 0x19, 0x04, 0x8f, 0x53, 0xa9}},
    {{0x10, 0xa5, 0x6c, 0xf5, 0xdf, 0xcd, 0x9a, 0xdb}},
    {{0xeb, 0x75, 0x09, 0x5c, 0xcd, 0x98, 0x6c, 0xd0}},
    {{0x51, 0xa9, 0xcb, 0x9e, 0xcb, 0xa3, 0x12, 0xe6}},
    {{0x96, 0xaf, 0xad, 0xfc, 0x2c, 0xe6, 0x66, 0xc7}},
    {{0x72, 0xfe, 0x52, 0x97, 0x5a, 0x43, 0x64, 0xee}},
    {{0x5a, 0x16, 0x45, 0xb2, 0x76, 0xd5, 0x92, 0xa1}},
    {{0xb2, 0x74, 0xcb, 0x8e, 0xbf, 0x87, 0x87, 0x0a}},
    {{0x6f, 0x9b, 0xb4, 0x20, 0x3d, 0xe7, 0xb3, 0x81}},
    {{0xea, 0xec, 0xb2, 0xa3, 0x0b, 0x22, 0xa8, 0x7f}},
    {{0x99, 0x24, 0xa4, 0x3c, 0xc1, 0x31, 0x57, 0x24}},
    {{0xbd, 0x83, 0x8d, 0x3a, 0xaf, 0xbf, 0x8d, 0xb7}},
    {{0x0b, 0x1a, 0x2a, 0x32, 0x65, 0xd5, 0x1a, 0xea}},
    {{0x13, 0x50, 0x79, 0xa3, 0x23, 0x1c, 0xe6, 0x60}},
    {{0x93, 0x2b, 0x28, 0x46, 0xe4, 0xd7, 0x06, 0x66}},
    {{0xe1, 0x91, 0x5f, 0x5c, 0xb1, 0xec, 0xa4, 0x6c}},
    {{0xf3, 0x25, 0x96, 0x5c, 0xa1, 0x6d, 0x62, 0x9f}},
    {{0x57, 0x5f, 0xf2, 0x8e, 0x60, 0x38, 0x1b, 0xe5}},
    {{0x72, 0x45, 0x06, 0xeb, 0x4c, 0x32, 0x8a, 0x95}}};

std::uint64_t VectorToInt(const std::array<std::uint8_t, 8>& v) {
  const std::uint64_t v0 = v[0];
  const std::uint64_t v1 = v[1];
  const std::uint64_t v2 = v[2];
  const std::uint64_t v3 = v[3];
  const std::uint64_t v4 = v[4];
  const std::uint64_t v5 = v[5];
  const std::uint64_t v6 = v[6];
  const std::uint64_t v7 = v[7];

  return ((v7 << 56) | (v6 << 48) | (v5 << 40) | (v4 << 32) | (v3 << 24) |
          (v2 << 16) | (v1 << 8) | (v0 << 0));
}

}  // anonymous namespace

static_assert(17955292667519703601ULL ==
                  SipHash::Compute("abcdefghijklmnopqrstuvwxyz", 0, 0),
              "Compile-time hash doesn't match!!");

TEST(SipHash, Vectors) {
  const std::uint64_t k0 = 0x0706050403020100;
  const std::uint64_t k1 = 0x0f0e0d0c0b0a0908;

  std::array<std::uint8_t, kMaxLength> input;
  for (std::size_t i = 0; i < kMaxLength; i++) {
    input[i] = i;
    EXPECT_EQ(
        VectorToInt(kVectors[i]),
        SipHash::Compute(BlockReader<std::uint8_t>(input.data(), i), k0, k1));
  }
}
